This auction is for a set of pliers modeled from an original set that a NCR repair man would have used back in the day. These will work on all 200-300 class large and small cash registers to remove and reset the key rings. The base will swing around to accommodate the key stems. They will also work on other brands of antique cash registers. Don't discard your old key rings as they are getting hard to find and expensive. If you're a serious cash register restorer this item is for you.